A simple way to identify the composition of clothing fabrics is the combustion method. The method is to pull a cloth yarn containing warp and weft yarn at the seam of the clothing, light it with fire, observe the state of the burning flame, smell the smell of the burning yarn, and observe the residue. Burning to determine whether it is consistent with the fabric composition marked on the clothing durability label to distinguish the authenticity of the fabric composition.

1. Cotton and hemp fibers

Cotton fibers and hemp fibers burn immediately after burning, burning rapidly, and the flames are yellow and blue smoke. The difference between the smell after burning and the ash after burning is that cotton burns away the smell of paper, while hemp burns away the smell of vegetation. When burned, cotton has almost no gray-black or gray ash, while hemp produces a small amount of gray-white ash.

Second, wool fibers and silk

When the hair meets the fire smoke, the burning blister, the burning speed is slow, and the burning smell of burning hair is emitted. After burning, the ash is mostly smooth black spherical particles that break when pressed by the finger. After firing, the silk will shrink into clumps, burn slowly, with a hissing sound, emit the smell of burning hair, and after burning, form black brown ball gray, which can be twisted by hand.

3. Nylon and polyester

Polyamide fibers (the scientific name for polyamide fibers) rapidly shrink and melt into a white gel when near a flame. It melts and drips into flames and bubbles. There is no flame when it burns. It's hard to keep burning after you leave the flame. It smells like celery. Things are not easy to break. Polyester, scientifically known as polyester, is easy to ignite. It melts and contracts when near the flame. When it burns, it emits black smoke and a yellow flame when it melts. It gives off a sweet smell. The burnt ash is a dark brown lump that you can twist with your fingers.

4. Acrylic and polypropylene

Acrylic fiber scientific name polyacrylonitrile fiber, softened and contracted near the fire, black smoke after fire, the flame is white, burning quickly after leaving the flame, emitting a bitter taste of burning, after burning the ashes for irregular black hard blocks, with the hand is fragile. Polypropylene, the scientific name of polypropylene fiber, melts and shrinks near the flame, flammable, slowly burns in the fire and gives off black smoke, the upper end of the flame is yellow, the lower end is blue, gives off the smell of oil, and the ashes after burning are hard round light yellow brown particles, easy to twist and break.

v. Vinylon and chlorine

The scientific name of Vinylon is polyvinyl formaldehyde fiber, not easy to burn, the nearby flame melts and shrinks, there is a little flame at the top when burning, the flame becomes larger when melting, there is thick black smoke, there is a smell with bitter taste, the black black beads after burning can be crushed by fingers. Polyvinyl chloride fibers (the scientific name for chloroprene) are difficult to burn and go out immediately after they catch fire. The flame is yellow with green and white smoke at the lower end. It gives off a pungent, pungent and sour taste. After burning, the ash is dark brown irregular mass.

6. Spandex and fluoride

Spandex (the scientific name for spandex) burns when burned near a fire. The flame is blue when it burns. When it leaves the fire, it will continue to burn and give off a special pungent smell. When burned, the ash is a soft, fluffy black ash. Fluorocarbon, the scientific name of ptfe fiber, the iso organization called it fluorite fiber, close to the flame only melt, difficult to ignite, do not burn, the edge of the flame is blue-green carbonization, melting and decomposition, the gas is toxic, the melt is hard round black beads. Fluorine fibers are commonly used in the textile industry to produce high-performance sewing threads.

Viscose fiber and cuprammonium fiber

Viscose fibers are flammable, burn fast, the flame is yellow, and give off the smell of burning paper. After burning, the ash is less, smooth, twisted, and a light gray or off-white fine powder. Copper ammonium fiber, commonly known as tiger kapok, burns near the flame, burns fast, the flame is yellow, and gives off the smell of ester and acid. After burning, there is very little ash, only a small amount of gray black ash.

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